Link your sub-domain to AWS API Gateway

#aws #dns #api #lamda

Let's hook up the name myapp.nanosoft.co.za to an AWS API Gateway

Go to the Certificate Manager console
Request a certificate
Select "Request a public certificate"
Add one or more domain names, in my case I add myapp.nanosoft.co.za
Choose DNS validation
You'll be given a CNAME entry to which you'll need to register at your DNS Registrar e.g:

HOST: _xxxxxxxxxxxxxxxxxxxxx.myapp.nanosoft.co.za 
TYPE: CNAME
VALUE: _xxxxxxxxxxxxxxxx.xxxxxxxxx.acm-validations.aws.

This is necessary to validate that you own the subdomain

$> dig +short _xxxxxxxxxxxxxxxxxxxxx.myapp.nanosoft.co.za

you should get a response of

_xxxxxxxxxxxxxxxx.xxxxxxxxx.acm-validations.aws.

Once AWS has found this validation token, you'll notice that the certificate manager will update the status of the certificate from "Pending" to "Issued". Next, let's create an API Custom Domain record

Go to the API Gateway console
Go to Custom domain names and create a domain name
1. Choose TLS 1.2
2. Regional Endpoint
3. Choose the newly created Certificate for myapp.nanosoft.co.za
4. Click "Create Domain Name"

Go to the Route 53 console
Create a Hosted Zone, In my case it would be nanosoft.co.za
Create an A Record for a subdomain by choosing Simple Routing
add the subdomain myapp to the existing nanosoft.co.za domain
Choose "A record"
For Value/Route to, choose "Alias to API Gateway API"
Choose the region where the api exists, in my case af-south-1
Choose the matching API gateway, e.g. d-xxxxxx.execute-api.af-south-1.amazonaws.com
Click "Define simple record"
Now that you have this A Record, we need a CNAME in our DNS to link the subdomain. Do so by adding a CNAME record at your DNS Registrar

Host: myapp, //or myapp.nanosoft.co.za depending on your DNS Registrar 
Type: CNAME, 
Value: d-xxxxxx.execute-api.af-south-1.amazonaws.com

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